Here is the full list of all 28 The Hex achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Crashed Secrets of Legendaria.
Crashed Waste World.
Free Vallamir.
Wooed a Great Kraken.
Discovered the truth about Mr. Shrewd.
Find Missing No. in Secrets of Legendaria.
Receive 4 card readings from Catarina in Walk.
Deal at least 500 damage in a single strike in Secrets of Legendaria.
Crashed Walk
Learn all of Catarina's secrets in Super Weasel Kid.
Crashed Combat Arena X.
Crashed Super Weasel Kid '09.
Buy 10 upgrades from the Scrap Shop in Waste World.
Score a true KO on Alley Gator in Combat Arena X.
Complete the original Super Weasel Kid without any help from Mr. Shrewd.
Opened The Hex.
Completed ???'s memory.
Help Rebecha survive the first wave in Walk.
Crack all the vending machines at The Six Pint.
Completed Lazarus' memory.
Perform a 360 No Scope with the sniper rifle.
Completed Rust's memory.
Activate a gated mod in Waste World.
Completed Chandrelle's memory.
Crack a soda vending machine at The Six Pint.
Completed Bryce's memory.
Score a 1000 hit combo in Combat Arena X.
Completed Super Weasel Kid's memory.